// import Vue from 'vue'
export default (Vue) => {
  // v-dialogDragWidth: 弹窗宽度拖大 拖小
  Vue.directive('dialogDragCompletion', {
    componentUpdated(el, binding, vnode, oldVnode) {
      // 弹框可拉伸最小宽高
      const minWidth = 400;
      const minHeight = 300;

      // 初始非全屏
      let isFullScreen = false;

      // 当前顶部高度
      let nowMarginTop = 0;

      // 获取弹框头部（这部分可双击全屏）
      const dialogHeaderEl = el.querySelector('.el-dialog__header');

      // 弹窗
      const dragDom = el.querySelector('.el-dialog');

      // 给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；
      dragDom.style.overflow = 'auto';

      // 清除选择头部文字效果
      // dialogHeaderEl.onselectstart = new Function("return false");

      // 头部加上可拖动cursor
      dialogHeaderEl.style.cursor = 'move';

      if (el.style.zIndex) {
        if (!window.windowZIndex) {
          window.windowZIndex = el.style.zIndex;
        }
        if (el.style.zIndex <= window.windowZIndex) {
          window.windowZIndex++;
          el.style.zIndex = window.windowZIndex;
        }
      }

      // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
      const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
      const moveDown = (e) => {
        if (el.style.zIndex <= window.windowZIndex) {
          window.windowZIndex++;
          el.style.zIndex = window.windowZIndex;
        }

        // 鼠标按下，计算当前元素距离可视区的距离
        const disX = e.clientX - dialogHeaderEl.offsetLeft;
        const disY = e.clientY - dialogHeaderEl.offsetTop;

        // 获取到的值带px 正则匹配替换
        let styL; let
          styT;

        // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px

        if (sty.left.includes('%')) {
          styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);
          styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);
        } else {
          styL = +sty.left.replace(/\px/g, '');
          styT = +sty.top.replace(/\px/g, '');
        }

        document.onmousemove = function (e) {
          // 通过事件委托，计算移动的距离
          const l = e.clientX - disX;
          const t = e.clientY - disY;

          // 移动当前元素
          dragDom.style.left = `${l + styL}px`;
          dragDom.style.top = `${t + styT}px`;

          // 将此时的位置传出去
          // binding.value({x:e.pageX,y:e.pageY})
        };

        document.onmouseup = function (e) {
          document.onmousemove = null;
          document.onmouseup = null;
        };
      };

      dialogHeaderEl.onmousedown = moveDown;
      // 当前宽高
      let nowWidth = 0;
      // let nowHight = 0
      // 双击头部全屏效果
      dialogHeaderEl.ondblclick = (e) => {
        if (isFullScreen === false) {
          // nowHight = dragDom.clientHeight
          nowWidth = dragDom.clientWidth;
          nowMarginTop = dragDom.style.marginTop;

          dragDom.style.left = 0;
          dragDom.style.top = 0;
          dragDom.style.height = '100VH';
          dragDom.style.width = '100VW';
          dragDom.style.marginTop = 0;

          isFullScreen = true;

          dialogHeaderEl.style.cursor = 'initial';
          dialogHeaderEl.onmousedown = null;
        } else {
          dragDom.style.height = 'auto';
          dragDom.style.width = `${nowWidth}px`;
          dragDom.style.marginTop = nowMarginTop;

          isFullScreen = false;

          dialogHeaderEl.style.cursor = 'move';
          dialogHeaderEl.onmousedown = moveDown;
        }
      };

      dragDom.onmousemove = function (e) {
        // let moveE = e

        if (
          e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10
				|| dragDom.offsetLeft + 10 > e.clientX
        ) {
          dragDom.style.cursor = 'w-resize';
        } else if (
          el.scrollTop + e.clientY
				> dragDom.offsetTop + dragDom.clientHeight - 10
        ) {
          dragDom.style.cursor = 's-resize';
        } else {
          dragDom.style.cursor = 'default';

          dragDom.onmousedown = null;
        }

        dragDom.onmousedown = (e) => {
          const { clientX } = e;
          const { clientY } = e;
          const elW = dragDom.clientWidth;
          const elH = dragDom.clientHeight;
          const EloffsetLeft = dragDom.offsetLeft;
          const EloffsetTop = dragDom.offsetTop;

          dragDom.style.userSelect = 'none';

          const ELscrollTop = el.scrollTop;

          // 判断点击的位置是不是为头部
          if (
            clientX > EloffsetLeft
					&& clientX < EloffsetLeft + elW
					&& clientY > EloffsetTop
					&& clientY < EloffsetTop + 100
          ) {
            // 如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;
          } else {
            document.onmousemove = function (e) {
              // 移动时禁用默认事件
              e.preventDefault();

              // 左侧鼠标拖拽位置
              if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {
                // 往左拖拽
                if (clientX > e.clientX) {
                  dragDom.style.width = `${elW + (clientX - e.clientX) * 2}px`;
                }

                // 往右拖拽
                if (clientX < e.clientX) {
                  if (dragDom.clientWidth < minWidth) {
                    console.log();
                  } else {
                    dragDom.style.width = `${elW - (e.clientX - clientX) * 2}px`;
                  }
                }
              }

              // 右侧鼠标拖拽位置
              if (
                clientX > EloffsetLeft + elW - 10
							&& clientX < EloffsetLeft + elW
              ) {
                // 往左拖拽
                if (clientX > e.clientX) {
                  if (dragDom.clientWidth < minWidth) {
                    console.log();
                  } else {
                    dragDom.style.width = `${elW - (clientX - e.clientX) * 2}px`;
                  }
                }

                // 往右拖拽
                if (clientX < e.clientX) {
                  dragDom.style.width = `${elW + (e.clientX - clientX) * 2}px`;
                }
              }

              // 底部鼠标拖拽位置
              if (
                ELscrollTop + clientY > EloffsetTop + elH - 20
							&& ELscrollTop + clientY < EloffsetTop + elH
              ) {
                // 往上拖拽
                if (clientY > e.clientY) {
                  if (dragDom.clientHeight < minHeight) {
                    console.log();
                  } else {
                    dragDom.style.height = `${elH - (clientY - e.clientY) * 2}px`;
                  }
                }

                // 往下拖拽
                if (clientY < e.clientY) {
                  dragDom.style.height = `${elH + (e.clientY - clientY) * 2}px`;
                }
              }
            };

            // 拉伸结束
            document.onmouseup = function (e) {
              document.onmousemove = null;

              document.onmouseup = null;
            };
          }
        };
      };
    },

  });
};
